i'm still overweight (morbidly obese, by my doctor's bmi chart) and i don't overeat or eat unhealthy. i'm just not into exercise/have limited mobility because of disabilities, so i don't burn enough off. but my weight isn't from shoving fast food in my mouth (i know my doctor's given me that 'y the fuck u lyin'' look when i've told him what i eat on a day to day basis before because clearly i must be eating nothing but junk food to be morbidly obese.)

so there are mitigating factors as to why someone might be overweight. maybe they have limited mobility. maybe they have a shitty metabolism. maybe they're on medication that slows that shitty metabolism down even more. maybe they do shovel fast food into their face at an alarming rate. it's just annoying and it's why you get people getting offended when the blanket remark is 'all fatties are fat because of poor eating' when that's not always or even often the case.